It's no surprise that there's a link between not stretching your muscles and crippling back pain. Admittedly you work at an office all day, bum blued to your chair, but that's no excuse to continue your non-movement when you get home. In fact, if you have an office job it is almost indispensible that you stretch your muscles out or else you will develop a pinched spinal cord.

By learning the four types of hamstring stretches in this video, you'll be armed with ways to increase muscle length and strength, a bodily power necessary for everything from everyday tasks to sports.